“It’s huge and it’s gorgeous,” said Vera Blanquie, membership representative at the Rohnert Park Chamber of Commerce. The $800 million Graton Resort & Casino, just outside Rohnert Park in southern Sonoma County, officially opens its doors at 10 a.m. The 24/7 operation includes 3,000 slot and video poker machines, 144 gaming tables, a food court and four full-service restaurants. It’s game on for Northern California’s largest tribal casino.